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प्रश्न
Find the odd one out and give its explanation.
विकल्प
Zinc coating
Tinning
Electroplating
Calcination
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उत्तर
Calcination
Explanation-
Calcination is a process involved in extraction of carbonate ores while others are methods used for prevention of corrosion.
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संबंधित प्रश्न
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
What iron compound is present in haematite ore? Also write its chemical formula.
Name the metal which is extracted from the ore called 'rock salt'.
Which metal is extracted from calamine ore?
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
Give reasons, why aluminum is used in:
In aluminiothermy
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
How many valence electrons are present in non- metals?
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Explain the concept of Calcination.
Explain the reactions of nonmetals with water with the help of examples.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
